The soil is pure fine white sand. They seem to grow well in the sand however ever i'm pretty lucky to have a big turkey nest close by. I've been mixing about 20% in with the sand and it's working well. Any more than thee 20% and the water doesn't penetrate due to the oil being present off the turkey's feathers. The water just beads otherwise. I'll definitely keep an eye on them to see if they want to reveg. I've also got a few panama's there to keep an eye on too. Thanks for your advise!
Interesting re the oil. Bush turkey is the compost factory of the bush.